Leak on a NSString that's released

I'm finishing my app and it's time to fix all the leaks, so I use Instruments.

Here's the code and the leak...

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    [connection release];

    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    [responseData release];
    //NSString *responseString2 = [NSString stringWithFormat:@"%s%@%s", "[", responseString, "]"]; 
    // Pour ajouter les [] si y'en a pas autour de tout le contenu JSON, et on doit utiliser responseString2 au lieu de responseString à la ligne ci-dessous
    NSArray *tableau = [responseString JSONValue];
    [responseSt开发者_StackOverflow社区ring release];
    NSDictionary *dico = [tableau objectAtIndex:0];

It is responseString that leaks BUT I release it after put this value in the array... How can I delete the leak? I don't understand my mistake.

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Leaks is showing you where the leak was allocated, not where it was actually leaked; not the extra retain that is causing the problem.

Use the Allocations instrument to track all the retain/release calls on the object and find the extra retain. That'll be your leak.

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My explanation of how to do Heapshot based analysis should help you (as it can be used to track down problems exactly like this, too).